especially for development of more precise methods. Some experience in the 
problems of measuring very small objects has indicated that much higher 
precision should be obtainable even with unmodified elassical photogrammetric 
equipment, and evaluation of the potential of cameras confirms this. 
Advances may immediately be made in several aspects by using 
i) Finer grain photosensitive materials, 
ii) Self-luminous targets, such as fibre optics and lasers, 
iii) Multi-station recording for bundle solution, and by 
iv) Measurement of plates to higher precision, with greater automation. 
The practical results on an interim basis of the application of some of 
these ideas are given in the form of experimental measurements of a space 
frame, and of a three-axis measuring machine. The limitation to progress 
caused by the lack of flatness of commercially available plates and their 
instability in conditions of varying humidity is at present the most serious 
factor, implying a liability to local errors in plate co-ordinates of the 
order of 5um. The study of means to overcome these difficulties is in hand. 
Further developments continue with the UMK equipment, and with other 
recording systems. 
The authors would like to thank Mr. F.Edson and the Quality Assurance 
Directorate (Ordnance) of the Royal Arsenal Woolwich for allowing us to use 
the C.U.P.E. three-axis machine, and for permission to publish the photograph 
thereof. 
References 
BURCH, J.M. ,and FORNO,C., 1982, Preliminary assessment of a new high precision 
camera. International Archives of Photogrammetry,24 (5) 
GATES,J.W.C.,1975. Three-dimensional location and measurement by coherent 
optical methods. Photogrammetric Engineering and Remote sensing, 
41 (11):1349-1354 
GRANSHAW,S.1.,1980. Bundle Adjustment Methods in Engineering Photogrammetry. 
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SCOTT,P.J.,1976. Close Range Camera Calibration: a New Method .Photogrammetric 
Record, 8 (48):806-812 
TOZER, B.A.,WEBSTER, J.M.,and DAVIS, C.R., 1980. Engineering Applications of 
High Resolution Holography of Large Volumes. Proceedings of Electron 
Optics Laser International '80 , ICP Scientific and Technical press, 
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